Rewrite persistence to use Windows / macOS / Linux native keyrings

.gitattributes

@@ -16,6 +16,16 @@
 # in Unix via a file share from Windows, the scripts will work.
 *.sh text eol=lf
 
+# .editorconfig declares end_of_line = crlf for the entire tree. Force CRLF in
+# the working copy so cross-platform CI (and Linux/macOS contributors) see the
+# files exactly as editorconfig demands -- otherwise the IDE0055 formatting
+# analyzer (treat-warnings-as-errors) fails the build on non-Windows runners.
+*.cs       text eol=crlf
+*.csproj   text eol=crlf
+*.props    text eol=crlf
+*.targets  text eol=crlf
+*.editorconfig text eol=crlf
+
 ###############################
 # Git Large File System (LFS) #
 ###############################

.github/workflows/cross-platform.yml

@@ -0,0 +1,56 @@
+name: Cross-platform verification
+
+on:
+  push:
+    branches: [main, develop]
+    paths-ignore:
+      - "**.md"
+      - ".github/ISSUE_TEMPLATE/**"
+      - ".github/pull_request_template.md"
+  pull_request:
+    paths-ignore:
+      - "**.md"
+      - ".github/ISSUE_TEMPLATE/**"
+      - ".github/pull_request_template.md"
+  workflow_dispatch:
+
+concurrency:
+  group: cross-platform-${{ github.ref }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+
+jobs:
+  verify:
+    name: Build & Test (${{ matrix.os }})
+    runs-on: ${{ matrix.os }}
+    timeout-minutes: 15
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, windows-latest, macos-latest]
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Setup .NET SDK 10.0
+        uses: actions/setup-dotnet@v4
+        with:
+          dotnet-version: 10.0.x
+
+      - name: Install libsecret (Linux)
+        if: runner.os == 'Linux'
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y libsecret-1-0
+
+      - name: Restore
+        run: dotnet restore CredentialCache.sln
+
+      - name: Build
+        run: dotnet build CredentialCache.sln --configuration Release --no-restore
+
+      - name: Test
+        run: dotnet test CredentialCache.Test/CredentialCache.Test.csproj --configuration Release --no-build

CredentialCache.Test/CredentialCache.Test.csproj

@@ -1,11 +1,15 @@
-<Project>
+<Project>
   <Sdk Name="MSTest.Sdk" />
   <Sdk Name="ktsu.Sdk" />
 
   <PropertyGroup>
     <IsTestProject>true</IsTestProject>
     <TargetFramework>net10.0</TargetFramework>
     <TargetFrameworks></TargetFrameworks>
+    <!-- Avoid pulling Microsoft.NETCore.App.Host.{distro-specific}-RID packages
+         that some SDK builds resolve based on the host distro. Tests run via
+         `dotnet test` / `dotnet exec` and don't need an apphost executable. -->
+    <UseAppHost>false</UseAppHost>
   </PropertyGroup>
 
   <ItemGroup>